I think the burning smell is unrelated and just a coincidence. I've noticed a burning smell a couple times and it disappeared after a good undercarriage rinse. My suspicion is that it's either road grime or wiper fluid burning on the hot cats (windshield runoff drains onto the cats).
Good luck with the issue. Keep us posted on the cause.
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2013 Cadillac V-Wagon, RIP Z
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